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Investigation of solar selective and microstructural properties of molybdenum black immersion coatings on cobalt substrates

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Abstract

Molybdenum black solar selective coatings have been produced on cobalt by immersion in a solution of ammonium paramolybdate and nickel sulphate. The cobalt was electroplated on nickel-plated copper prior to immersion in the paramolybdate solution. The maximum solar absorptance of the resulting molybdenum black coating was about 0.91. The minimum emittance was about 0.1 for coatings on cobalt deposited with an addition agent and about 0.23 for coatings on cobalt deposited without addition agent in the 60 °C plating solution. These differences have been related to the coating morphology determined by scanning electron microscopy. The emittance of coatings on cobalt deposited without addition agent decreases (or remains unchanged) during short-term heat treatment while that of coatings deposited on cobalt plated with addition agent increases somewhat. Reduction of the cobalt plating bath temperature to 45 °C can also lead to good initial coating properties but without the requirement for an addition agent in the cobalt plating bath. XPS studies show that the oxidation state of molybdenum in the coatings is approximately + 5 corresponding to Mo4O11. This reduces to + 4 after argon ion bombardment. Some cobalt may be present in the coatings in the form of CoO.

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References

  1. R. Hosseini, PhD thesis, Brunei University (1981).

  2. B. E. Smith, R. Hosseini, C. Farmakis andJ. K. Critchley, in Proceedings of Solar World Forum (International Solar Energy Society, Congress), Brighton, August 1981, edited by D. O. Hall and J. Morton (Pergamon Press, Oxford, 1982) p. 226.

    Google Scholar 

  3. F. Jahan andB. E. Smith.J. Mater. Sci. Lett. 5 (1986) 905.

    Google Scholar 

  4. Idem., Solar Energy Mater. 20 (1990) 215.

    Google Scholar 

  5. G. B. Smith, P. Hillery andK. Teytz,Thin Solid Films 108 (1983) 239.

    Google Scholar 

  6. O. P. Agnihotri, B. K. Gupta, A. K. Agarwal andV. P. Bhatnagar,ibid. 109 (1983) 193.

    Google Scholar 

  7. G. B. Smith andK. Teytz,Solar. Energy Mater. 9 (1984) 449.

    Google Scholar 

  8. J. A. Duffie andW. A. Beckman, “Solar Engineering of Thermal Processes” (John Wiley, New York, 1980) p. 146.

    Google Scholar 

  9. J. A. Wiebelt andJ. B. Henderson,J. Heat Transfer 101 (1979) 101.

    Google Scholar 

  10. F. Jahan, PhD Thesis, Brunei University (1987).

  11. N. S. McIntyre andM. G. Cook,Anal. Chem. 47 (1975) 2208.

    Google Scholar 

  12. G. B. Smith, A. Ignatiev andG. Zajac,J. Appl. Phys. 51 (1980) 4186.

    Google Scholar 

  13. T. Robert, M. Bartel andG. Offergold,Surf. Sci. 33 (1972) 123.

    Google Scholar 

  14. W. E. Swartz andD. M. Hercules,Anal. Chem. 43 (1971) 1774.

    Google Scholar 

  15. T. S. Moss, G. J. Burell andB. Ellis, “Semiconductor Optoelectronics” (Butterworths, London, 1973).

    Google Scholar 

  16. M. J. Kennedy, PhD Thesis, Brunei University (1972).

  17. H. S. Potdar, A. B. Mandale, S. D. Sathaye, A. P. B. Sinha,J. Mater. Sci. 22 (1987) 2023.

    Google Scholar 

  18. B. Briggs, “Handbook of X-ray and ultra-violet photo-electron spectroscopy” (Heyden, London, 1977).

    Google Scholar 

  19. K. S. Kim, W. E. Baitinger, J. W. Amy andN. Wino-Grad,J. Electron Spectrosc. Relat. Phenom. 5 (1974) 351.

    Google Scholar 

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Jahan, F., Smith, B.E. Investigation of solar selective and microstructural properties of molybdenum black immersion coatings on cobalt substrates. J Mater Sci 27, 625–636 (1992). https://doi.org/10.1007/BF00554027

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  • DOI: https://doi.org/10.1007/BF00554027

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